CH. XIII] 

 W, 



RHEOSTATS AND OTHER BALLAST 



529 



Wi 



FIG. 284. ADJ USTABLE RHEOSTAT 

 MADE OF SHEETS OF TIN. 



A, B, C, D Clip-connectors to hold 

 the ends of the wires. 



Permanent connectors c n 1-2 are 

 used to join the further ends of the tin 

 strips 1-2 and 3-4 and a connector (c n) 

 is used between B and C. 



J, J' Movable adjusters to include more or less of the resistance in the 

 circuit and thus increase or diminish the amperage. 



This rheostat is composed of four sheets of tin cut as shown in fig. 285. It is, 

 therefore, four rheostats in series (see fig. 287). As here connected all four 

 sheets are used. By putting supply wire W 2 from A to C or from D to B only 

 two of the sheets would be used. Then by means of the adjusters / and /' the 

 amount of resistance can be increased or diminished at will. 



The small diagram at the left shows how the pairs of strips of each side are 

 connected with each other at the far end. 



At the near end of the frame the arched wire connects the two pairs of plates 

 of both sides at B and C. 



